The Patriarch of this household is less common (aka “special/rare”).  The rest of the brood would be defined as common based on their birthdate.  About right.  See The Daily Viz for background on study and sample set.  The chart has had more than 250,000 views.  If you want to read more about this study, hit this link.  Still wouldn’t change the end result.  🙂

Source: ilovecharts

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